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Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments
  • Question

  • A copper specimen has resistivity equal to 1.8 x 10-8 ohm-m at room temperature. At a temperature of 700 K, the resistivity is likely to be


  • Options
  • A. 1.6 x 10-8 ?-m
  • B. 2 x 10-8 ?-m
  • C. 3 x 10-8 ?-m
  • D. 6 x 10-8 ?-m

  • Correct Answer
  • 6 x 10-8 ?-m 

    • Materials and Components problems

    Search Results

    • 1. An electron is moving around a proton, in a circle of radius R. If flux density in the region is increased from zero to B, the force on the electron is

    • Options
    • A.
    • B. eR (dB / dt)
    • C. eRB
    • D.
      • Discuss
    • 2. Nickel is a non-magnetic material.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. When a material is in superconducting state and a magnetic field is applied

    • Options
    • A. the superconducting property is not affected
    • B. the superconducting property may be affected and resistivity may increase from zero to a low value
    • C. the superconducting property may be destroyed
    • D. the material may become an insulator
      • Discuss
    • 4. The induced magnetic dipole moment is independent of the permanent magnetic dipole moment.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. In terms of Planck's constant h, the orbital angular momentum of an electron is

    • Options
    • A. h
    • B.
    • C. 2ph
    • D.
      • Discuss
    • 6. The number of protons in a silicon atom are

    • Options
    • A. 4
    • B. 8
    • C. 12
    • D. 14
      • Discuss
    • 7. A rare gas having N atoms/m3 is subjected to an electric field E. The electric dipole moment per unit volume is proportional to N and E.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. As the atoms of rare gases become larger, electronic polarizability

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. may increase or decrease
      • Discuss
    • 9. Carbon steel has a residual flux density of 1 Wb/m2.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Assertion (A): Dielectric constant is independent of temperature unless the temperature is extremely high.

      Reason (R): For normal temperatures the number of atoms per unit volume is constant.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss

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